<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>xmind</title>
    <style>
        html,body{
            margin: 0;
            padding: 0;
            height: 100%;
        }
    </style>
</head>
<body>
    <div class="boc" style="width:100%;height: 100%;overflow: hidden;">

        <canvas id="cavans" ></canvas>
    </div>
    <script type="module" src="./index.js"></script>
</body>
</html>